Why is IndyCar shelving its manufacturer war?

Competing IndyCar manufacturers Honda and Chevrolet will revert to only being engine suppliers in 2018, and aero kit development has been halted for next season. Why has the series removed an area of competition that was only recently adopted?

It's no surprise really. IndyCar's long-awaited decision to freeze aero development and implement a standard kit for Chevrolet and Honda teams in 2018 has been applauded by the team owners who were opposed to the aerodynamic project in the first place.

Like it or loathe it, the topic of aero kits has dominated IndyCar over the past two years. It's been the talking point in a variety of senses, from early issues like bits falling off too easily, to Chevy and its partner Pratt & Miller overwhelming the draggy effort from Honda and Wirth Engineering across 2015, to the Japanese manufacturer controversially winning a bid to be allowed to overhaul its design for this season.